Mail preparation system



FIG. 1 is a top, front and right side perspective view of a mail preparation system which incorporates the new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof; and,

FIG. 6 is a rear elevational view thereof. 

The ornamental design for a mail preparation system, as shown and described. 